CN112004980A

CN112004980A - Control assembly for a motor vehicle door

Info

Publication number: CN112004980A
Application number: CN201980020377.4A
Authority: CN
Inventors: S·弗拉内克
Original assignee: Brose Bamberg Co ltd
Current assignee: Brose Bamberg Co ltd; Brose Fahrzeugteile SE and Co KG
Priority date: 2018-03-19
Filing date: 2019-03-18
Publication date: 2020-11-27
Also published as: EP3768923A1; US20210363789A1; DE102018106410A1; JP2021518499A; WO2019179910A1; KR20200133364A

Abstract

The invention relates to a control assembly for a motor vehicle door (2), wherein the control assembly (1) is supplied with electrical power from a vehicle electrical system (4) in the installed state, wherein the motor vehicle door (2) has a motor vehicle lock (6) having an electrical opening drive (7) for the motorized opening of the motor vehicle lock (6), wherein the control assembly (1) has a door control unit (11) for actuating the opening drive (7), wherein the control assembly (1) is switched from a normal operating mode to an emergency operating mode when the control assembly (1) detects a predetermined emergency, wherein the control assembly (1) has a power transmission unit (12) and wherein it is provided that electrical power is received in the emergency operating mode via the power transmission unit (12) from a mobile device (13) of a first type. It is proposed that the power transfer unit (12) is set up for wireless reception of electrical power from a first type of mobile device (13) and the door control unit (11) is set up to receive electrical power from the first type of mobile device (13) via the power transfer unit (12) in an emergency operation type and to use the received electrical power to operate the opening drive (7) for opening the motor vehicle lock (6).

Description

Control assembly for a motor vehicle door

Technical Field

The invention relates to a control assembly for a motor vehicle door according to the preamble of claim 1, a motor vehicle door according to claim 13 with such a control assembly, a motor vehicle according to claim 15 with such a motor vehicle door, and a method for actuating a motor vehicle door according to the preamble of claim 16.

Background

Motor vehicle doors of modern motor vehicles are increasingly equipped with so-called "electronic locks" which can be opened only electrically by means of an electrical opening drive (Oeffnungsantrieb). During this period of time, which is accompanied by a significant comfort increase due to the omission of the actuating force, additional measures have to be taken for obtaining operational safety in the event of an emergency, in particular in the event of a failure of the on-board system voltage.

In a known control assembly (DE 102014105872 a1), each motor vehicle door is associated with a motor vehicle lock with a locking pin (Schloss), a catch (Sperrklinke) associated with the locking pin and an electric actuating drive for the motorized lifting of the catch. The motor vehicle lock is equipped with an additional energy store which takes over the electrical supply of the starter in the event of a voltage failure of the on-board electrical system. A disadvantage here is the fact that continuous recharging of the energy store is costly and a high degree of reliability can only be ensured by periodic replacement of the energy store.

The known control module (US 9118193B 2) from which the invention is based can be transferred from a normal operating mode to an emergency operating mode in the event of a voltage failure of the vehicle electrical system, in which the relationship of the electrical power to the mobile telephone is provided. For this purpose, the control assembly is equipped with a power transfer unit with a power plug to which a mobile phone for transferring electrical power can be coupled. This solution is technically complex to operate and requires a high implementation effort.

A charging station for a mobile telephone provided by a door module of a motor vehicle is known from DE 102013002747 a 1. This ensures that a possibly present mobile telephone can always be charged wirelessly, so that in the event of a failure of the vehicle electrical system there is the possibility of a call for telephone assistance. The improvement in vehicle engineering in the event of a voltage failure of the on-board electrical system is not yet connected to it.

Disclosure of Invention

The object of the invention is to design and improve the known control assembly in such a way that the opening of the motor vehicle door is ensured in an emergency situation in an operationally simple manner and manner.

The above-mentioned problem is solved in a control assembly according to the preamble of claim 1 by the features of the characterizing part of claim 1.

It is important to consider that the reception of electrical power can be received wirelessly by a mobile device, referred to herein as a "first type of mobile device". Thus, each power plug for transferring electrical power is eliminated. Furthermore, there is a fundamental possibility of using charging stations for mobile devices, in particular for mobile telephones, which are already present in the vehicle interior for receiving electrical power.

It is proposed in detail that the power transfer unit is set up for wireless reception of electrical power from a mobile device of the first type and that the door control unit is set up to receive electrical power from a mobile device of the first type via the power transfer unit in the emergency operation type and to use the received electrical power to operate the opening drive for lifting the catch.

The door control unit can be equipped with a microcontroller which is responsible for a predetermined sequence in the case of an actuation of the opening drive. In principle, however, the door control unit can also be a simple network of lines via which the reception and transmission of electrical power is possible depending on the type of operation.

A preferred dual use of the power transfer unit is the object of claim 2. It is provided here that the power transfer unit is not only configured for wireless reception of electrical power, but also for wireless emission of electrical power to a mobile device of a first type or to a mobile device of a second type. The power transfer unit can be, for example, a charging station according to claim 3, which now receives the additional function of wirelessly receiving electric power in the emergency operation mode.

The first type of mobile device is in a further preferred embodiment according to claim 4 a mobile device for wireless generation of electrical power, for example a mobile power supply. In principle, it can also be a mobile telephone here, provided that this is configured to emit electrical power wirelessly.

A second type of mobile device is set up for receiving electric power wirelessly according to claim 5 in contrast thereto. Here, it may be a correspondingly equipped mobile telephone.

With the proposed solution, it is conceivable, for example, for the power transfer unit to be used in the normal operating mode for charging a second type of mobile device, for example a mobile telephone, and for the power transfer unit to be used in the emergency operating mode for receiving electrical power from a first type of mobile device, for example a charging station. The advantage of the dual use of the power transfer unit is particularly apparent here.

In order to avoid an undesired discharge of the respective mobile device via the power transfer unit, it is preferably provided according to claim 6 that a response on the user side is necessary before the discharge.

It is also preferred that the requirement for the motorized opening of a motor vehicle lock according to claim 7 is that the electric door actuating element is actuated on the user side. This ensures that the operator is not surprised by the motorized opening of the motor vehicle in the emergency operating mode.

In an equally preferred embodiment according to claim 8, the power transfer unit receives the further function of establishing a wireless communication link (kommunikationstrcke) to the mobile device. In principle, it is possible to have an authentication session proceed, the result of which determines whether the electrical power is allowed to be received by the respective mobile device.

In principle, the received electrical power can be transmitted directly (i.e. without temporary storage) to the door control unit and/or to the opening drive (claim 9). Alternatively, but also conceivable, an energy store (zwischenspericher) is provided for temporarily storing the received power. The first-mentioned solution can be implemented cost-effectively, while with the second-mentioned solution even higher operational safety can be achieved, since possible power fluctuations by temporarily storing the electrical power received by the mobile device have no effect.

The preferred embodiment of claim 11 relates to the possibility for defining a predetermined emergency situation, the detection of which triggers the transfer of the control module into the emergency operation type. In a preferred embodiment, this detection of an emergency is due to the control unit receiving an impact signal from an impact sensor. Alternatively, an emergency situation may be defined in which the vehicle electrical system voltage falls below a predetermined minimum threshold value.

In particular for crash situations, it can be advantageous if, as stated in claim 12, the control unit, in the emergency operation mode, via the input/output unit, issues a request to the operator to place the mobile device into the charging station. This requirement can be achieved in particular also acoustically, for example by a speech output. With this measure, the probability of energy being present in the form of a mobile device inside the motor vehicle, which can be used in an emergency operation mode, is increased.

According to a further teaching of independent significance according to claim 13, a motor vehicle with a motor vehicle lock and a control assembly according to the proposal is claimed as such. Reference is allowed to all embodiments for the control assembly according to the proposal.

In a preferred embodiment according to claim 13, the inner lining (inneverkleidung) of the motor vehicle door provides a charging station for the first type of mobile device or for the second type of mobile device. In this connection, reference is likewise made to embodiments of the teaching which were first mentioned.

According to a further teaching according to claim 15, which also has independent significance, a motor vehicle with at least one proposed motor vehicle door is required as such. Reference is made to all embodiments for the motor vehicle door according to the proposal and for the control assembly according to the proposal.

According to a further teaching according to claim 16, which also has independent significance, a method for actuating a motor vehicle door by means of a proposed control assembly is claimed as such.

In the method according to the proposal, the control module is supplied with electrical power from the vehicle electrical system in the installed state. In the emergency operation type, electric power is received from the first type of mobile device via the power transfer unit.

It is important for the teaching according to the proposal that in the emergency operation type, electrical power is received wirelessly from the first type of mobile device via the power transfer unit and that the actuator is actuated for lifting the catch with the aid of the door control unit using the received electrical power. The proposed method thus relates to the mode of operation of the proposed control unit, so that reference is likewise made in this respect to the embodiment of the proposed control unit.

Drawings

In the following, the invention is explained in more detail on the basis of the drawings depicting embodiments. In the drawings:

FIG. 1 shows a fully schematic illustration of a motor vehicle according to the recommendation with a control assembly according to the recommendation, and

fig. 2 likewise shows a motor vehicle door of the motor vehicle according to fig. 1 in a completely schematic illustration.

Detailed Description

The proposed control assembly 1 is associated with a motor vehicle door 2 of a motor vehicle 3. The motor vehicle door 2 may be any motor vehicle door of a motor vehicle 3. Here and preferably, the motor vehicle door 2 is a side door, in particular a front side door, of the motor vehicle 3. All embodiments associated therewith are correspondingly suitable for all other motor vehicle doors 2, in particular for rear motor vehicle doors or for tailgate.

The control assembly 1 is supplied with electrical power in the installed state from a motor vehicle electrical system 4 supplied by a vehicle battery 5.

The motor vehicle door 2 has a motor vehicle lock 6 with an electric opening drive 7 for the motorized opening of the motor vehicle lock 6. Here and preferably, the motor vehicle lock 6 is equipped with a ratchet mechanism (Sperrwerk)8 consisting of a locking pin 9 and a catch 10. For the motorized opening of the motor vehicle lock 6, the opening drive 7 is drive-coupled or couplable to the catch 10, so that the catch 10 can be raised by the opening drive 7 in a motorized manner.

The control assembly 1 has a door control unit 11 for actuating the opening drive 7. The door control unit 11 is preferably equipped with a logic unit which coordinates the motorized opening of the motor vehicle lock 6. In principle, however, the door control unit 11 can also only provide a line network, which is required for the energization of the opening drive 7. The door control unit 11 can in a further alternative be provided by a central door control system, which actuates the opening drives of all other motor vehicle doors 2 accordingly.

In the case of normal-operation-compliant use, the control assembly 1 is of the normal-operation type, in which the operator can control the motorized opening of the motor vehicle lock 6 via the electric

door actuating elements

2a,2 b.

As soon as the control unit 1 detects a predetermined emergency, it is then switched into the emergency operating mode. A predetermined emergency situation corresponds, for example, to an at least partial failure of the vehicle electrical system voltage. The detection of a predetermined emergency is preferably carried out by means of the door control unit 11.

Fig. 2 shows that the control assembly 1 also has a power transfer unit 12, wherein it is provided that in the emergency operation type, electrical power is received from the mobile device 13 of the first type via the power transfer unit 12.

It is important at this time that the power transfer unit 12 is set for wirelessly receiving electric power from the first type of mobile device 13. Wireless transfer of electrical power is currently achieved via inductive or capacitive coupling. For this purpose, different standards are already known, which are preferably used in the solutions according to the proposal. Examples for this are the Qi standard, PMA standard, A4WP standard, etc.

It is also important that the door control unit 11 is set up to receive electrical power from the first type of mobile device 13 via the power transfer unit 12 in the emergency operation type and to use the received electrical power to actuate the opening drive 7 for opening the motor vehicle lock 6. The first type of mobile device 13 is preferably a mobile energy storage, in particular a mobile power supply, as is also explained.

The motor vehicle lock 6 is preferably an electronic lock which can be unlocked only electrically, i.e. by means of the unlocking drive 7. In other words, the catch 10 can only be lifted by means of the opening drive 7 and cannot be lifted, for example, by means of a mechanical force acting chain to the inner door handle or the outer door catch. In the case of such an electronic lock, the solution according to the proposal is particularly important, since the functionality of the opening actuator 7 must be ensured even in the event of a voltage failure of the vehicle electrical system.

Interesting in the exemplary embodiment shown and preferred in this respect is the fact that the power transfer unit 12 is set not only for receiving electric power, but also for generating electric power. This means that the power transfer unit 12 is set up for charging the first type of mobile device 13 or the second type of mobile device 14 for the purpose of wirelessly emitting electric power to the respective

mobile device

13,14 in the normal operating mode. For this purpose, the power transfer unit 12 has a wireless transmitting/receiving unit 15, which serves not only for receiving electric power, but also for generating electric power. For this case, i.e., the power transfer unit 12 is operated with inductive coupling, the transmitter/receiver unit 15 has a coil arrangement 16, which is used in each case doubly, i.e., not only for receiving but also for generating electrical power. The abstract representation naturally includes the fact that the electrical power is temporarily converted into magnetic power for its transfer.

In the case of the above-described dual use of the power transfer unit 12, this is preferably so that the power transfer unit 12 forms a charging station 17 for the first type of mobile device 13 and/or for the second type of mobile device 14, wherein the respective

mobile device

13,14 can be inserted into the charging station 17 in this case and preferably in a form-fitting manner. It is thereby ensured that the concerned

mobile device

13,14 is in the vicinity of the power transfer sense of the power transfer unit 12. This takes into account the case that the power transfer unit 12 is preferably set for transferring electric power at a close distance.

The mobile devices 13 of the first type are preferably at least set up for generating electric power wirelessly. Accordingly, the first type of mobile device 13 is preferably the above mentioned mobile power supply or the like. In principle, however, it can also be provided that the mobile devices 13 of the first type are additionally designed for wireless reception of electrical power. Also in this regard, the first type of mobile device 13 may then be a mobile power source. It is finally also conceivable that the mobile device 13 of the first type is a mobile telephone, which is set up not only for the wireless emission of electric power but also for the reception of electric power.

The second type of mobile device 14 is preferably at least set up for receiving electric power wirelessly. The second type of mobile device 14 is preferably a correspondingly equipped mobile phone.

Fig. 2 shows a first type of mobile device 13, which is designed according to the type of mobile power supply. The mobile power supply has an energy store 18 in the form of a battery, a charging control device 19 and a charging adapter 20 which is set up for the bidirectional transfer of electric power. The mobile device 14 of the second type is designed here as a mobile telephone, which has an energy store 21 in the form of a battery, a charging control device 22 and a charging adapter 23, which is likewise designed for bidirectional transfer of electric power. But at least it is provided that the charging adapter 20 of the first type of mobile device 13 is set for wirelessly emitting electric power and the charging adapter 23 of the second type of mobile device 14 is set for wirelessly receiving electric power.

In order to avoid undesired discharges of the

mobile devices

13,14 located in the vicinity of the power transfer unit 12, it is preferably provided that the control assembly 1 queries the response made by the operator via a not shown input/output unit and/or via the relevant

mobile device

13,14 in the emergency operating mode and only releases the reception of electrical power via the power transfer unit 12 after the response. This answering function of the control assembly 1 is preferably implemented in the door control unit 11.

It can furthermore be seen from the illustration according to fig. 2 that the control assembly 1 has electrical

door actuating elements

2a,2b mentioned above, wherein in the emergency operation mode the actuation of the opening drive 7 can be triggered by actuating the relevant electrical

door actuating elements

2a,2 b. This means that the motorized opening of the motor vehicle lock 6 in the case of a change from the normal operating mode to the emergency operating mode does not take place abruptly, but rather, as is usual per se, the opening of the motor vehicle lock 6 is triggered only by the actuation of the electric

door actuating elements

2a,2 b. Depending on the installation of the motor vehicle door 2, this can be a door actuating element 2a which can be actuated from the interior of the motor vehicle 3 and/or a door actuating element 2b which can be actuated from the outside of the motor vehicle 3.

The power transfer unit 12 here and preferably receives a further function, namely the function of establishing a wireless communication link. The power transfer unit 12 accordingly has a communication unit 24 with which a communication path to the respective mobile device 14 can be established. Preferably, here it is a mobile device 14 of the second type, which has a corresponding communication unit 25. In the exemplary embodiment shown and preferred for this purpose, the communication unit 24 of the power transfer unit 12 is designed separately from the transmit/receive unit 15. In a particularly preferred embodiment, it is provided, however, that the communication unit 24 is provided by the transmitting/receiving unit itself. In a particularly preferred embodiment, the transmission of the electrical power and the formation of the communication path are carried out via the same transmission hardware. This results in a particularly simple construction in terms of hardware technology.

In the case of the above-mentioned construction of the communication path section arranged between the

mobile devices

13,14 and the power transfer unit 12, a further possibility of avoiding undesired discharges of the

mobile devices

13,14 concerned is achieved. The receiving of the electrical power via the power transfer unit 12 preferably takes place only after the communication path has been established and in particular only after an authentication request for the communication path has been successfully carried out. This means that the electric power received by the power transfer unit 12 is not released until the authentication request for the communication path section has been successfully executed.

Fig. 2 shows that the power transfer unit 12 delivers the received electrical power to the door control unit 11 without temporary storage in the energy buffer. Alternatively or additionally, it can be provided that the received electrical power is supplied to the start drive 7 without temporary storage in the energy store. A simple implementation is advantageous here, since the energy register can be omitted. Furthermore, there is no energy loss that is always associated with the charging and discharging of the energy buffer.

Alternatively, it can be provided that the power transfer unit 12 transmits the received electrical power to an energy store, which serves to electrically supply the door control unit 11 and/or to open the drive 7. This is even more costly in terms of hardware. It follows, however, that the electrical supply to the door control unit 11 and/or the opening drive 7 is provided independently of possible fluctuations in the received electrical power.

In order to define a predetermined emergency (for which the detection control unit 1 is switched from the normal operating mode into the emergency operating mode), different advantageous variants are conceivable. Here and preferably, the predetermined emergency is defined by the control unit 1 receiving a crash signal from the crash sensor 26. Fig. 2 shows such an impact sensor 26, which is used in particular for detecting a lateral impact.

Alternatively or additionally, the predetermined emergency is defined in that the vehicle electrical system voltage falls below a predetermined minimum threshold value. Other types of predetermined emergency situations are contemplated.

In order to ensure that all energy sources in the form of the

mobile devices

13,14 present in the interior of the motor vehicle are available for the motorized opening of the motor vehicle lock 6, in particular in the event of a crash, the control assembly 1 preferably issues a request to the operator via a not shown input/output unit to insert the

mobile devices

13,14 into the charging station 17 in the emergency operating mode. The same input/output unit can be used here, which can be implemented for the above-mentioned response.

According to a further teaching which is of independent significance, a motor vehicle 3 having a motor vehicle lock 6 and a control assembly 1 according to the proposal is required as such. In this connection, reference is made to all embodiments of the control assembly 1.

In a particularly preferred embodiment, the control unit 1 is designed to receive electrical power from the interior of the motor vehicle. In this context, this is preferably so that the above-mentioned charging station 17 is constructed from the interior lining 27 of the motor vehicle door 2.

According to a further teaching which likewise has independent significance, a motor vehicle 3 with at least one motor vehicle door 3 mentioned above is required as such. In this connection, it is likewise permissible to refer to all embodiments of the control assembly 1 for the motor vehicle door 2 and according to the proposal.

In the motor vehicle 3 according to the proposal, the above-mentioned charging station 17 can be arranged at the motor vehicle door 2 or at a plurality of motor vehicle doors 2. Alternatively or additionally, however, the charging station 17 may also be arranged at another location in the interior of the motor vehicle, in particular at a center console of the motor vehicle.

According to a further teaching, which likewise has independent significance, a method for actuating a motor vehicle door 2 according to the proposal by means of a control assembly 1 according to the proposal is likewise required.

According to the proposed method, in the emergency operation mode, electrical power is wirelessly received from the first type of mobile device 13 via the power transfer unit 13, wherein the opening drive 7 is actuated by means of the door control unit 11 using the received electrical power for opening the motor vehicle lock 6. In this connection, reference is likewise made to all embodiments of the proposed motor vehicle door 2 and of the proposed control assembly 1.

Claims

1. Control assembly for a motor vehicle door (2), wherein the control assembly (1) is supplied with electrical power from a motor vehicle electrical system (4) in the installed state, wherein the motor vehicle door (2) has a motor vehicle lock (6) with an electrical opening drive (7) for the motorized opening of the motor vehicle lock (6), wherein the control assembly (1) has a door control unit (11) for actuating the opening drive (7),

wherein the control unit (1) switches from a normal operating mode to an emergency operating mode when the control unit (1) detects a predetermined emergency,

wherein the control assembly (1) has a power transfer unit (12) and wherein it is arranged to receive electrical power from a first type of mobile device (13) via the power transfer unit (12) in an emergency operation type,

characterized in that the power transfer unit (12) is set for wireless reception of electrical power from the first type of mobile device (13) and the door control unit (11) is set to receive electrical power from the first type of mobile device (13) via the power transfer unit (12) in an emergency operation type and to operate the opening drive (7) with the received electrical power for opening the motor vehicle lock (6).

2. Control arrangement according to claim 1, characterized in that the power transfer unit (12) is set up in a normal operating mode for the wireless emission of electric power to the respective mobile device (13,14) for charging the mobile device (13) of the first type or the mobile device (14) of the second type, preferably in that the power transfer unit (12) has a wireless transmit/receive unit (15) for both receiving electric power and emitting electric power.

3. The control assembly according to claim 2, characterized in that the power transfer unit (12) is configured as a charging station (17) for the first type of mobile device (13) and/or the second type of mobile device (14) and that the mobile devices (13,14) can be placed, in particular form-fittingly, into the charging station (17) and can thereby be brought into the vicinity of the power transfer unit (12) in the power transfer sense.

4. Control assembly according to any of the preceding claims, characterized in that the mobile device (13) of the first type is set for wireless emitting electric power, preferably the mobile device (13) of the first type is additionally set for wireless receiving electric power.

5. The control assembly according to claim 2 and if required according to claim 3 or 4, characterized in that the mobile device (14) of the second type is set for receiving electric power wirelessly.

6. Control assembly according to any one of the preceding claims, characterized in that the control assembly (1) queries a response made by an operator in an emergency operation type via an input/output unit and/or the mobile device (13,14) and only releases the reception of electric power via the power transfer unit (12) after the response.

7. Control assembly according to one of the preceding claims, characterized in that the control assembly (1) has an electrical door actuating element (2a,2b) and in an emergency operating mode the actuation of the opening drive (7) can be triggered by actuating the electrical door actuating element (2a,2 b).

8. Control assembly according to any one of the preceding claims, characterized in that the power transfer unit (12) is set up to build a wireless communication section to the mobile device (13,14) and that the power transfer unit (12) releases the received electrical power only after building the communication section, preferably after successfully performing an authentication challenge on the communication section.

9. Control assembly according to any of the preceding claims, characterized in that the power transfer unit (12) delivers the received electrical power to the door control unit (11) and/or to the opening drive (7) without temporary storage in an energy buffer.

10. Control assembly according to any of claims 1 to 8, characterized in that the power transfer unit (12) delivers the received electrical power to an energy buffer for electrically supplying the door control unit (11) and/or the opening driver (7).

11. Control assembly according to any one of the preceding claims, characterized in that a predetermined emergency situation is defined by the control assembly (1) receiving a collision signal from a collision sensor (26) and/or by the on-board electrical system voltage falling below a predetermined minimum threshold value.

12. Control assembly according to claim 3 and, if required, any one of claims 4 to 11, characterized in that the control assembly (1) issues a request to the operator via an input/output unit to place a mobile device (13,14) into the charging station (17) in an emergency operation type.

13. Motor vehicle door with a motor vehicle lock (6) and a control assembly (1) according to any one of the preceding claims.

14. The motor vehicle door according to claim 13, characterized in that the power transfer unit (12) is designed as a charging station (17) for the first type of mobile device (13) and the second type of mobile device (14), the respective mobile device (13,14) being insertable in particular form-fittingly into the charging station (17) and thus being able to be brought into the vicinity of the power transfer unit (12) in the power transfer sense, the motor vehicle door (2) having an inner lining (27) and the inner lining (27) forming the charging station (17).

15. Motor vehicle with at least one motor vehicle door (2) according to claim 13 or 14.

16. Method for actuating a motor vehicle door (2) by means of a control assembly (1), wherein the control assembly (1) is supplied with electrical power from an electrical system (4) on board a motor vehicle in a mounted state, wherein the motor vehicle door (2) has an electrical opening drive (7) for the motorized opening of a motor vehicle lock (6),

wherein the control assembly (1) has a door control unit (11) for actuating the opening drive (7),

wherein the control unit (1) switches from a normal operating mode into an emergency operating mode when the control unit (1) detects a predetermined emergency,

wherein the control assembly (1) has a power transfer unit (12), and wherein electrical power is received from a first type of mobile device (13) via the power transfer unit (12) in an emergency operation type,

it is characterized in that the preparation method is characterized in that,

in an emergency operation mode, electric power is wirelessly received from the first type of mobile device (13) via the power transfer unit (12) and the opening drive (7) is actuated by means of the door control unit (11) using the received electric power for opening the motor vehicle lock (6).